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original fault was the combustion unit(burner,fan, pcb and gasvalve!)hugely expensive, after completion the tenant then mentioned no hot water for last 6weeks! replaced flow sensor-basically a thin micro card,no difference. my problem is the domestic water cartridge which is special order, seems...

DHW IS VERY POOR UNLESS CENTRAL HEATING IS SELECTED, I SUSPECT THE DIVERTER VALVE IS PASSING AS THE FLOW IS GETTING HOT. DO I NEED TO REPLACE THE WHOLE VALVE OR IS THERE A QUICKER (CHEAPER) SOLUTION. MANY THANKS RAY